如何解析嵌套的 JSON 数据结构 [英] How to parse nested JSON data structure

问题描述

在 Windows Phone 应用程序中，我需要解析 JSON 数据.我能够获取未嵌套的键的值.但是如果 JSON 数组里面有数组，那我该如何从 JSON 文件中提取值呢?

In a Windows Phone app I need to parse JSON data. I am able to get the values for keys which aren't nested. But if the JSON has arrays inside arrays, then how do I extract values from the JSON file?

过去我所做的是将 JSON 解析为 JArray 对象，然后从 JToken 中获取指定字符串键的值.

In the past what I did was parse the JSON into a JArray object, then from the JToken I got the value of a specified string key.

在下面的JSON中，people有men和women，而men本身有很多不同的男人身份证.因此，如果我将这个完整的东西作为 JSON 字符串，我如何打印特定人的 ID 值?如果这里没有嵌套数组，我可以转换成 JArray 并访问索引值，但是现在该怎么做呢?

In the JSON below, people has men and women, and men itself has many men with different IDs. So if I have this complete thing as a JSON string, how do I print the value of the ID of a particular man? I could have converted into JArray and access indexed values if there were no nested arrays here, but how to do it now?

这是我的 JSON:

{
    "people": [
        {
            "men": [
                {
                    "id": 0,
                    "name": "alex",
                    "age": 25
                },
                {
                    "id": 1,
                    "name": "bob",
                    "age": 26
                },
                {
                    "id": 2,
                    "name": "charlie",
                    "age": 27
                }
            ]
        },
        {
            "women": [
                {
                    "id": 0,
                    "name": "alexys",
                    "age": 25
                },
                {
                    "id": 1,
                    "name": "bethany",
                    "age": 26
                },
                {
                    "id": 2,
                    "name": "catherine",
                    "age": 27
                }
            ]
        }
    ]
}

推荐答案

从顶层JToken，可以使用SelectToken()导航到JArray 有你感兴趣的数据:

From the top-level JToken, you can use SelectToken() to navigate to the JArray that has the data you are interested in:

JToken token = JToken.Parse(json);
JArray men = (JArray)token.SelectToken("people[0].men");

从那里您可以像往常一样处理 JArray:

From there you can process the JArray as you normally would:

foreach (JToken m in men)
{
    Console.WriteLine("id: " + m["id"]);
    Console.WriteLine("name: " + m["name"]);
    Console.WriteLine("age: " + m["age"]);
    Console.WriteLine();
}

对于 women 数组也是一样，除了 SelectToken() 路径是 people[1].women.

Same thing for the women array, except the SelectToken() path would be people[1].women.

演示: https://dotnetfiddle.net/7BoiUO

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